Here to be of the "same mind" is a metonym that means to be in agreement with each other. AT: "to be in agreement with each other" or "to be united" (See: [[rc://en/ta/man/translate/figs-metonymy]])
# praise with one mouth
This means to be united in praising God. AT: "praise God together in unity as if only one mouth were speaking" (See: [[rc://en/ta/man/translate/figs-metonymy]])